Jack, You said: "At the alternator end, the output from this wire should be zero - " This is incorrect. If you check the master wiring diagram you will see that the yellow/brown wire connects to one side of the battery warning lamp. The other side of the lamp is connected to the #5 fuse buss which is 12 V positive whenever the ignition is in the run mode. DMC Joe Tech Information, DMC Joe Help Club, & Store "Summer Parts Sale" http://shopping.oraclesmallbusiness.com/dsvstore DeLorean Website Directory www.dmc.tv